The reduction of
CO
2
emissions and its elimination from
the atmosphere has become one of the major problems worldwide, since
CO
2
is the main cause of the greenhouse effect and climate
change. In recent years, a great number of carbonaceous materials
that can be used as CO
2
adsorbents have been synthesized.
The strategy is usually to synthesize the materials and determine
their adsorption capacity without studying previously the factors
that influence this capacity. In this work, different properties of
the adsorbents are analyzed to study their influence on the CO
2
adsorption capacity. For this purpose, 10 adsorbents have
been synthesized using different strategies and characterized with
X-ray photoelectron spectroscopy, X-ray diffraction, and micro-Raman
spectroscopy. The percentage of sp
2
carbons, the position
of the D + D′ peak of the second-order Raman spectrum, the
micropore volume, and the grain size of the C sp
2
domains
have been related to the amount of CO
2
adsorbed by the
adsorbents. The results confirm a linear relationship between the
volume of the micropores and the CO
2
uptake and it proves
that CO
2
retention is favored in those materials that,
in addition to having a high volume of micropores, also have low grain
size of C.
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